Transferring a Keynote file to the iPad

First have down loaded iPad keynote progam

Never tried drag&drop - does that even work?

If you already have Keynote for the iPad: Connect your iPad, select it in iTunes, go to the "Apps" tab. Find the Keynote entry there - it has an option to add presentations that should be transferred to the iPad.

At the bottom of the app's pane in iTunes here is a section called sharing. It is the app's pane that appears under the device when it is connected to your computer. The sharing section lists those apps where data/files can be directly imported via syncing. KeyNotes is one such app. You have to click on the app to which you want to add a files and then add the file. If you do not have KeyNote on the iPad, you can still display the presentation by emailing to the iPad or using some other apps that read KeyNote presentations.